You are here

Skier Triggered Avalanche on Middle Peak, Castle Lake

Location Name: 
Middle Peak, Castle Lake
Region: 
Castle Lake
Date and time of avalanche (best estimate if unknown): 
Mon, 02/18/2019 - 1:30pm
Observation made by: 
Forecaster
Red Flags: 
Recent avalanche activity

Location Map

United States
41° 13' 12.8568" N, 122° 23' 18.258" W
US

Avalanche Observations

Details

A D1.5 avalanche was skier triggered from Middle Peak of Castle Lake today. This avalanche was sympathetically released 2-3 feet away in less steep terrain near the ridge. It failed above the Febuary 13th rain crust as a 1F hard slab. Elevation of the start zone is 6,400 feet and it ran a total of 300 feet down the slope. The crown was 75 feet wide and 17 to 27 inches (45-70 cm) deep and broke at the convex roll over just below the ridge. The average slope angle is 28 degrees with a max incline of 39 degrees. The slope was on a northeast aspect on the east side of the large bowl above heart lake. This avalanche is a good example of the lingering wind slabs on leeward terrain. 

Characteristics

Avalanche Type: 
Slab
Trigger type: 
Skier
Slope: 
28degrees
Aspect: 
Northeast
Elevation: 
6 400ft.
Terrain: 
Above Treeline
Weak Layer: 
Old Snow
Bed Surface: 
Old Snow
Crown Height: 
2 ft
Avalanche Width: 
75ft.
Avalanche Length: 
300ft.

Weather Observations

Statistics

Cloud Cover: 
Clear
Blowing Snow: 
Yes
Precipitation: 
None
Accumulation rate: 
Less than 1 in. per hour
Air temperature: 
Below Freezing
Air temperature trend: 
Warming
Wind Speed: 
Moderate
Wind Direction: 
Northwest